phpList.org

550 High probability of spam - ONLY from phpList

Last week, I started getting bounces due to “550 High probability of spam.” It is happening on every single subscriber address except those within my domain. The bounce does not happen if I send the exact same message via Outlook client or Roundcube.

The log in phpList will say “SMTP Error: data not accepted.SMTP server error: DATA END command failed” but the email seems to actually be sent - but rejected by the receiving domain servers.

Sample bounce message:
user@gmail.com
host seproxy.web-hosting.com [162.255.118.62]
SMTP error from remote mail server after end of data:
550 High probability of spam

Running phpList 3.5.8.
The only other thread I could find similar to this edited the class.phplistmailer.php $sTimeStamp line and changed from $from to from $hostname. Making this change did not help.

My hosting provider is Namecheap (actually very good IMO) and they did a lot of checking on their end and claim there is nothing in their setup blocking the emails.

MXToolbox shows we are not on any blacklists.

I have SPF, DKIM and DMARC all configured correctly. Testing on MXToolbox shows the domain is as good as it can get on a shared server. Score on Mail-Tester.com is 10/10.

I’m completely at a loss on why the messages would bounce from phpList but not normal clients. Thanks in advance for any help figuring this out! I manage this for a town/charity/non-profit list and my next step is going to have to be moving to phplist.com and paying for that service.

@MikeVL Did the problem start happening after you upgraded to phplist 3.5.8? If so then you can try reverting to use phpmailer 5 instead of phpmailer 6, which became the default in 3.5.8. Add this line to the config.php file

define('USE_PHPMAILER6', false);

If you are sending to a range of domain, yahoo, gmail, hotmail etc, then it doesn’t seem likely that they would all reject all emails for the same reason. Maybe it is a problem with the smtp server through which phplist is configured to send.
Can you copy a complete bounce email here, use the toolbar code button </> so that it is displayed as plain text.

I was using 3.5.7 when it first started and I upgraded to 3.5.8 to see if that would help (it didn’t). I tried the config line you suggested anyway and there was no change.

With more testing, I found that changing the “From line” in the Campaign Content from Cathy HB cathyhb@mydomain.com to just cathyhb@mydomain.com actually allowed the campaign to send. The actual email account ‘noreply@mydomain.com’ is still being used as the actual sending and bounce address.

Source is below with a few edits for domain and IPs. I really appreciate any guidance here!

Return-Path: <>
Delivered-To: noreply@mydomain.com
Received: from business80.web-hosting.com
by business80.web-hosting.com with LMTP
id wM9cLFtb118nVxAAxQbnxw
(envelope-from <>)
for noreply@mydomain.com; Mon, 14 Dec 2020 07:32:27 -0500
Return-path: <>
Envelope-to: noreply@mydomain.com
Delivery-date: Mon, 14 Dec 2020 07:32:27 -0500
Received: from mailnull by business80.web-hosting.com with local (Exim 4.93)
id 1kon1f-004XYb-MP
for noreply@mydomain.com; Mon, 14 Dec 2020 07:32:27 -0500
X-Failed-Recipients: mikevl@hotmail.com
Auto-Submitted: auto-replied
From: Mail Delivery System Mailer-Daemon@business80.web-hosting.com
To: noreply@mydomain.com
References: 3VXpgS70zOOyLdlI3DgM5lbGY8WiF4hjEuHLzK8AKr0@mydomain.com
Content-Type: multipart/report; report-type=delivery-status; boundary=1607949147-eximdsn-1451821199
MIME-Version: 1.0
Subject: Mail delivery failed: returning message to sender
Message-Id: E1kon1f-004XYb-MP@business80.web-hosting.com
Date: Mon, 14 Dec 2020 07:32:27 -0500

–1607949147-eximdsn-1451821199
Content-type: text/plain; charset=us-ascii

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

mikevl@hotmail.com
host seproxy.web-hosting.com [162.255.118.61]
SMTP error from remote mail server after end of data:
550 High probability of spam

–1607949147-eximdsn-1451821199
Content-type: message/delivery-status

Reporting-MTA: dns; business80.web-hosting.com

Action: failed
Final-Recipient: rfc822;mikevl@hotmail.com
Status: 5.0.0
Remote-MTA: dns; seproxy.web-hosting.com
Diagnostic-Code: smtp; 550 High probability of spam

–1607949147-eximdsn-1451821199
Content-type: message/rfc822

Return-path: noreply@mydomain.com
Received: from [162.0.235.46] (port=44264 helo=mydomain.com)
by business80.web-hosting.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
(Exim 4.93)
(envelope-from noreply@mydomain.com)
id 1kon1X-004XPu-89
for mikevl@hotmail.com; Mon, 14 Dec 2020 07:32:23 -0500
Received: from pool-96-237-183-123.bstnma.fios.verizon.net [96.237.183.123] by mydomain.com with HTTP; Mon, 14 Dec 2020 07:32:19 -0500
Date: Mon, 14 Dec 2020 07:32:19 -0500
To: mikevl@hotmail.com
From: Cathy HB cathyhb@mydomain.com
Subject: Web-hosting email service
Message-ID: 3VXpgS70zOOyLdlI3DgM5lbGY8WiF4hjEuHLzK8AKr0@mydomain.com
X-phpList-version: 3.5.8
X-MessageID: 2608
X-ListMember: mikevl@hotmail.com
Precedence: bulk
List-Help: http://mydomain.com/maillist/?p=preferences&uid=6b659bb0107860613e2544694caa2853
List-Unsubscribe: http://mydomain.com/maillist/?p=unsubscribe&uid=6b659bb0107860613e2544694caa2853&jo=1
List-Unsubscribe-Post: List-Unsubscribe=One-Click
List-Subscribe: http://mydomain.com/maillist/?p=subscribe
List-Owner: mailto:mike@mydomain.com
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary=“b1_3VXpgS70zOOyLdlI3DgM5lbGY8WiF4hjEuHLzK8AKr0”
X-OutGoing-Spam-Status: No, score=-1.0

This is a multi-part message in MIME format.

–b1_3VXpgS70zOOyLdlI3DgM5lbGY8WiF4hjEuHLzK8AKr0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

'Web-hosting email service included in cPanel is a common email hosting,
which allows you to send emails, manage email accounts through webmail and
email clients (Outlook, Thunderbird, Mail.app, .etc) via SMTP/POP/IMAP
connection/protocols.

That service is a good choice if you need to use a number of standard email
accounts.

All regular email service features are available for Namecheap Private
Email users as well. However, with the Namecheap Private Email, you can
also setup Exchange accounts to synchronize appointments, tasks, calendar
and email folders between your Namecheap Private Email account and
supported devices and email clients.’=20

– powered by phpList, www.phplist.com

–b1_3VXpgS70zOOyLdlI3DgM5lbGY8WiF4hjEuHLzK8AKr0
Content-Type: multipart/related;
boundary=“b2_3VXpgS70zOOyLdlI3DgM5lbGY8WiF4hjEuHLzK8AKr0”;
type=“text/html”

–b2_3VXpgS70zOOyLdlI3DgM5lbGY8WiF4hjEuHLzK8AKr0
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

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=0A
=0AThat service is a good choi= ce if you need to use a number of standard email accounts.
=0A
= =0AAll regular email service features are available for Namecheap Private E= mail users as well. However, with the Namecheap Private Email, you can also= setup Exchange accounts to synchronize appointments, tasks, calendar and e= mail folders between your Namecheap Private Email account and supported dev= ices and email clients.'
=0A=0A

3D"p=
owered

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–b2_3VXpgS70zOOyLdlI3DgM5lbGY8WiF4hjEuHLzK8AKr0–

–b1_3VXpgS70zOOyLdlI3DgM5lbGY8WiF4hjEuHLzK8AKr0–

–1607949147-eximdsn-1451821199–

@MikeVL Please can you copy the bounce email again but use the code button </> so that it is treated as plain text. I expected the email address within the From header to be surrounded by < and > but it is not shown like that.

Sorry about that. Hopefully this is OK.

Return-Path: <>
Delivered-To: noreply@mydomain.com
Received: from business80.web-hosting.com
by business80.web-hosting.com with LMTP
id wM9cLFtb118nVxAAxQbnxw
(envelope-from <>)
for noreply@mydomain.com; Mon, 14 Dec 2020 07:32:27 -0500
Return-path: <>
Envelope-to: noreply@mydomain.com
Delivery-date: Mon, 14 Dec 2020 07:32:27 -0500
Received: from mailnull by business80.web-hosting.com with local (Exim 4.93)
id 1kon1f-004XYb-MP
for noreply@mydomain.com; Mon, 14 Dec 2020 07:32:27 -0500
X-Failed-Recipients: mikevl@hotmail.com
Auto-Submitted: auto-replied
From: Mail Delivery System Mailer-Daemon@business80.web-hosting.com
To: noreply@mydomain.com
References: 3VXpgS70zOOyLdlI3DgM5lbGY8WiF4hjEuHLzK8AKr0@mydomain.com
Content-Type: multipart/report; report-type=delivery-status; boundary=1607949147-eximdsn-1451821199
MIME-Version: 1.0
Subject: Mail delivery failed: returning message to sender
Message-Id: E1kon1f-004XYb-MP@business80.web-hosting.com
Date: Mon, 14 Dec 2020 07:32:27 -0500

–1607949147-eximdsn-1451821199
Content-type: text/plain; charset=us-ascii

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

mikevl@hotmail.com
host seproxy.web-hosting.com [162.255.118.61]
SMTP error from remote mail server after end of data:
550 High probability of spam

–1607949147-eximdsn-1451821199
Content-type: message/delivery-status

Reporting-MTA: dns; business80.web-hosting.com

Action: failed
Final-Recipient: rfc822;mikevl@hotmail.com
Status: 5.0.0
Remote-MTA: dns; seproxy.web-hosting.com
Diagnostic-Code: smtp; 550 High probability of spam

–1607949147-eximdsn-1451821199
Content-type: message/rfc822

Return-path: noreply@mydomain.com
Received: from [162.0.235.46] (port=44264 helo=mydomain.com)
by business80.web-hosting.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
(Exim 4.93)
(envelope-from noreply@mydomain.com)
id 1kon1X-004XPu-89
for mikevl@hotmail.com; Mon, 14 Dec 2020 07:32:23 -0500
Received: from pool-96-237-183-123.bstnma.fios.verizon.net [96.237.183.123] by mydomain.com with HTTP; Mon, 14 Dec 2020 07:32:19 -0500
Date: Mon, 14 Dec 2020 07:32:19 -0500
To: mikevl@hotmail.com
From: Cathy HB cathyhb@mydomain.com
Subject: Web-hosting email service
Message-ID: 3VXpgS70zOOyLdlI3DgM5lbGY8WiF4hjEuHLzK8AKr0@mydomain.com
X-phpList-version: 3.5.8
X-MessageID: 2608
X-ListMember: mikevl@hotmail.com
Precedence: bulk
List-Help: http://mydomain.com/maillist/?p=preferences&uid=6b659bb0107860613e2544694caa2853
List-Unsubscribe: http://mydomain.com/maillist/?p=unsubscribe&uid=6b659bb0107860613e2544694caa2853&jo=1
List-Unsubscribe-Post: List-Unsubscribe=One-Click
List-Subscribe: http://mydomain.com/maillist/?p=subscribe
List-Owner: mailto:mike@mydomain.com
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary=“b1_3VXpgS70zOOyLdlI3DgM5lbGY8WiF4hjEuHLzK8AKr0”
X-OutGoing-Spam-Status: No, score=-1.0

This is a multi-part message in MIME format.

–b1_3VXpgS70zOOyLdlI3DgM5lbGY8WiF4hjEuHLzK8AKr0
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'Web-hosting email service included in cPanel is a common email hosting,
which allows you to send emails, manage email accounts through webmail and
email clients (Outlook, Thunderbird, Mail.app, .etc) via SMTP/POP/IMAP
connection/protocols.

That service is a good choice if you need to use a number of standard email
accounts.

All regular email service features are available for Namecheap Private
Email users as well. However, with the Namecheap Private Email, you can
also setup Exchange accounts to synchronize appointments, tasks, calendar
and email folders between your Namecheap Private Email account and
supported devices and email clients.’=20

– powered by phpList, www.phplist.com –

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=0A
=0AThat service is a good choi= ce if you need to use a number of standard email accounts.
=0A
= =0AAll regular email service features are available for Namecheap Private E= mail users as well. However, with the Namecheap Private Email, you can also= setup Exchange accounts to synchronize appointments, tasks, calendar and e= mail folders between your Namecheap Private Email account and supported dev= ices and email clients.'
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–b1_3VXpgS70zOOyLdlI3DgM5lbGY8WiF4hjEuHLzK8AKr0–

–1607949147-eximdsn-1451821199–

The email address should be wrapped by < and > characters. That is the case when I send an email through phplist. Have you removed them as part of hiding the domains?

Trying again. Sorry - new to the forum and while I did read the FAQ/before posting, I still must have messed up…

Return-Path: <>
Delivered-To: noreply@mydomain.com
Received: from business80.web-hosting.com
	by business80.web-hosting.com with LMTP
	id QVxmL6HA11+MUS4AxQbnxw
	(envelope-from <>)
	for <noreply@mydomain.com>; Mon, 14 Dec 2020 14:44:33 -0500
Return-path: <>
Envelope-to: noreply@mydomain.com
Delivery-date: Mon, 14 Dec 2020 14:44:33 -0500
Received: from mailnull by business80.web-hosting.com with local (Exim 4.93)
	id 1kotlp-00Cjg6-MX
	for noreply@mydomain.com; Mon, 14 Dec 2020 14:44:33 -0500
X-Failed-Recipients: mikevl@hotmail.com
Auto-Submitted: auto-replied
From: Mail Delivery System <Mailer-Daemon@business80.web-hosting.com>
To: noreply@mydomain.com
References: <lqED2mibBdZX0cJvg9c4dW3AG6Dpw17Sh9t6damtYK4@mydomain.com>
Content-Type: multipart/report; report-type=delivery-status; boundary=1607975073-eximdsn-729096570
MIME-Version: 1.0
Subject: Mail delivery failed: returning message to sender
Message-Id: <E1kotlp-00Cjg6-MX@business80.web-hosting.com>
Date: Mon, 14 Dec 2020 14:44:33 -0500

--1607975073-eximdsn-729096570
Content-type: text/plain; charset=us-ascii

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  mikevl@hotmail.com
host seproxy.web-hosting.com [162.255.118.61]
SMTP error from remote mail server after end of data:
550 High probability of spam

--1607975073-eximdsn-729096570
Content-type: message/delivery-status

Reporting-MTA: dns; business80.web-hosting.com

Action: failed
Final-Recipient: rfc822;mikevl@hotmail.com
Status: 5.0.0
Remote-MTA: dns; seproxy.web-hosting.com
Diagnostic-Code: smtp; 550 High probability of spam

--1607975073-eximdsn-729096570
Content-type: message/rfc822

Return-path: <noreply@mydomain.com>
Received: from [162.0.235.46] (port=45666 helo=mydomain.com)
	by business80.web-hosting.com with esmtpsa  (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
	(Exim 4.93)
	(envelope-from <noreply@mydomain.com>)
	id 1kotlg-00CjWP-Lm
	for mikevl@hotmail.com; Mon, 14 Dec 2020 14:44:29 -0500
Received: from pool-96-237-183-123.bstnma.fios.verizon.net [96.237.183.123] by mydomain.com with HTTP; Mon, 14 Dec 2020 14:44:24 -0500
Date: Mon, 14 Dec 2020 14:44:24 -0500
To: mikevl@hotmail.com
From: Cathy HB <cathyhb@mydomain.com>
Subject: Web-hosting email service
Message-ID: <lqED2mibBdZX0cJvg9c4dW3AG6Dpw17Sh9t6damtYK4@mydomain.com>
X-phpList-version: 3.5.8
X-MessageID: 2608
X-ListMember: mikevl@hotmail.com
Precedence: bulk
List-Help: <http://mydomain.com/maillist/?p=preferences&uid=6b659bb0107860613e2544694caa2853>
List-Unsubscribe: <http://mydomain.com/maillist/?p=unsubscribe&uid=6b659bb0107860613e2544694caa2853&jo=1>
List-Unsubscribe-Post: List-Unsubscribe=One-Click
List-Subscribe: <http://mydomain.com/maillist/?p=subscribe>
List-Owner: <mailto:mike@mydomain.com>
MIME-Version: 1.0
Content-Type: multipart/alternative;
 boundary="b1_lqED2mibBdZX0cJvg9c4dW3AG6Dpw17Sh9t6damtYK4"
X-OutGoing-Spam-Status: No, score=-1.0

This is a multi-part message in MIME format.

--b1_lqED2mibBdZX0cJvg9c4dW3AG6Dpw17Sh9t6damtYK4
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

'Web-hosting email service included in cPanel is a common email hosting,
which allows you to send emails, manage email accounts through webmail and
email clients (Outlook, Thunderbird, Mail.app, .etc) via SMTP/POP/IMAP
connection/protocols.

That service is a good choice if you need to use a number of standard email
accounts.

All regular email service features are available for Namecheap Private
Email users as well. However, with the Namecheap Private Email, you can
also setup Exchange accounts to synchronize appointments, tasks, calendar
and email folders between your Namecheap Private Email account and
supported devices and email clients.'=20





-- powered by phpList, www.phplist.com --


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POP/IMAP connection/protocols.<br />=0A<br />=0AThat service is a good choi=
ce if you need to use a number of standard email accounts.<br />=0A<br />=
=0AAll regular email service features are available for Namecheap Private E=
mail users as well. However, with the Namecheap Private Email, you can also=
 setup Exchange accounts to synchronize appointments, tasks, calendar and e=
mail folders between your Namecheap Private Email account and supported dev=
ices and email clients.' <br />=0A=0A<p class=3D"poweredby" style=3D"text-a=
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--1607975073-eximdsn-729096570--

@MikeVL Thanks. There now doesn’t appear to be anything unusual with the original email sent by phplist.

I can send successfully using both forms of the From address that you showed, so I don’t think that there is anything in phplist that can be changed or fixed.

If changing the From address is the only change you made, and that was then delivered, then I guess anti-spam software is rejecting it. Is there anything for spam detection on your hosting control panel?